Process for the production of pattern effects upon cotton fabrics.



iris sn'rns FATE rion.

GEORGES HEBERLEIN, OF WATT'WIL, SWITZERLAND,

PROCESS FOR .THE PRODUCTION OF PATTERN EFFECTS UPON COTTON FABRICS.

No Drawing.

Fabrics, of which the following is a full,

clear, and exact specification.

A method of producing pattern effects upon cotton fabrics is known wherein concentrated sulfuric acid of from 45 to 55- B., which, as is known, serves to impart a parchmen'tizing action upon cellulose, is

washed with water, or in which a resist is printed upon the fabric, which, after this action has taken place for a few seconds, is

printed upon"the fabric, after which the latter is passed for a few seconds through sulfuric acid, and finally washed. By this means those parts wherethe sulfuric acid acts upon the fibers, that is to say, those parts at which the so-called parchmentizing process takes place, become finer, thinner, and more transparent, while those parts which have not been acted upon by the sul furic acid or have been reserved stand out as a pattern by reason of their less transparent quality and their greater thickness relatively to the more transparent background.

Now, it has been found that with this process more distinctive ornamental eflects can be obtained, if in carrying it out mercerized cotton fabric or fabric made of mercerized cottonand sulfuric acid of above B. are made use of. These enhanced effects, which would not be anticipated, are to be explained by the fact that the chemical al-' teration which cotton undergoes on being mercerized makes it more adaptable to reaction, whereby a greater transparency is ob- Specification of Letters Patent.

Application filed. May 29, 1914. Serial No. 841,805."

Patented J une 29, 1915.

tained in those parts of the fabric treated with sulfuric acid above 501} B. than with unmercerized cotton. It is a curious fact that in the treatment of mercerized cotton fabrics with sulfuric acid a parchmenti'zing action only results when the concentration of the acid is in excess of 5011; B.

An extremely marked transparent effect is obtained in carrying out the process by allowing sulfuric acid of 54 B. to act upon the cotton fabric for about five seconds.

As the parchmentizing parts of the mercerized cotton fabric possess an exceedingly great affinity for several dye-stuffs, and on dyeing color much darker than the remaining portions of the fabric, the effect of the process is considerably heightened by the a and finally washing out the acid after a fewseconds.

In witness whereof I have hereunto signed my name this 16th day of May, 1914:, in the presence of two subscribin witnesses.

GEORGES EBERLEIN. -Witnesses:

E, T. HoRLER, C. MUHR. 

